Remove the SOCAT-enhanced DOI from DSG files

[karlmattsmith]

The SOCAT-enhanced DOIs are no longer generated or used and should be removed from the DSG files. Normally this would just be a configuration file change. But since it is part of the "standard" known (meta)data types (gov.noaa.pmel.dashboard.server.DashboardServerUtils.ENHANCED_DOI) that are automatically added by the code (because at one time this value was used in the reports code), this requires deletions from the code.

[karlmattsmith]

The ENHANCED_DOI in the DSG files should be replace by the SOURCE_DOI

[karlmattsmith]

Leaving this open as this has not been fully tested. Also, the DSG files will all need to be regenerated to exchange the SOCAT-enhance DOI field with the source-data DOIs, then the ERDDAP reconfigured for the field change.